Space exploration began with the launch of Sputnik and Astrophysics was born as the application of physics to the phenomena observed by Astronomy, which etymologically means laws of the stars.
There are 2759 entries in this glossary.| Term | Definition |
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| Optical Double Star |
A pair of stars that lie close to each other in the sky by chance, but are not physically associated with each other as with a true binary star.
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